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y in (-oo:+oo)
(2/5)*y-8 = 9-((2/5)*y) // - 9-((2/5)*y)
(2/5)*y+(2/5)*y-9-8 = 0
4/5*y-17 = 0 // + 17
4/5*y = 17 // : 4/5
y = 17/4/5
y = 85/4
y = 85/4
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